Electbic signaling device



H. Rz ROOT.

ELECTRIC SIGNALING DEVICE.

APPLICATION FILED IuLY I9. 1915.

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m. w .W MI y@ mm@ MQW Im a www jBe it known that I, RALPH UNITED vSTATES PATEN RALPH n. noo'r, or CLEVELAND, oHrof ELECTRIC SIGNALTG DEVICE.

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To all whom t may concern;

R. Roo'r, a citizen lof the United States, lresiding at Cleveland, in the county of Cuyahoga and State'of hio, have invented a certain new anduseful Improvement inI Electric Signaling Devices, of which the following is a full,

clear, and exact description.

This invention relates to a signaling device of the typeknown as an electrically -actuated vibrator horn. f l

The objec'tof the invention is to .produce a horn of the type in which the partsare" largely made of`pieces stamped from sheet metal, v the Vpieces being assembled so as to produce a horn in a small number of operations, thereby permitting the horn 'to be produced at a low cost of manufacture.

Generally speaking, .the invention may be said to comprise theelementsand the combinations thereof set forth inthe aczompanying claims.

` Reference should bel-had: to the accompanying drawings forming a part of the.

specification in .which-*Figure .1 is a substantially central sectionalelevation of the horn; Fig. 2- is asectional elevation'upon the line 2-'-.2 ofnFig-. 1; Fig. 3 is a section along the vline 3-43 of Fig.l 1; 4 is a section on the line '4L-4 of Fig. 1; ig. 5 is a topplan view of a-'retaining member used in the horn construction; and Fig. 6 is a sideelevation of the part shown in Fig. 5v.

The horn shown and described is one in which a diaphragm'is vibrated by the movel ment of an armature of an electro-magnet,

'the electro-magnet being energized by an alternating current.

'At 1 there is'shown what I term a base member. This member is formed with an 'annular offset portion 2vwhich is adjacent the outer edge.` At one portion within the offset part 2 there is an arc-shaped piece of metal 3. This arc-shaped piece of metal is provided with. three threaded openings which are adapted to receive the threaded ends of screws 4. The segment portion 3 is of a radius the. same as theradius of the circular oset portion 2, and the segment is of such width that it tightly fits into the oifset .portion 2 at the portion thereof where Speciflcation of Letters Patent.

lPateinted Sept. 2, v1919.

Application tiled July 19, 1915. Serial No. `40,543.

n' vis placed. -rhe man my be slightly tion 2 and the arc-shaped pieceS: vThe screws 4 extend through the openings in the bracket 5A and into the threaded openings in the arc-shaped piece 3, thereby holding the bracket 5. securely to the base 1. The bracket 5 may assume any `desired shape, the function being to secure thehorn to the support to which it is' desired to attach the same., A

, The base 1 at substantially the central portion thereof is provided with an extending fiange 6. "This liange at its end portion is-inturned,- as indicated at 7. The horn proper or amplifier which is indicated at 8, is `secured to the fiange 6 by having the metal at the inner portion of the amplifier 8 folded or crimped around the flange 7.

By forming the basel with its out.

amplifier is secured to the base. This I vbe- \f lieve has a certain effect upon the -tone produced by the diaphragm, and the construction has the advantage of preventing any diminution in-tone or quality of tone.

At 9 there is indicated a cap or cover member, which with `Jche basel incloses the mechanism of the horn, and further provides a support for parts ofthe horn which will later be described. This casing 9'isof such shape that it may be drawn from a blank of metal, and the outer iange or edge is crimped or bent around the outer iange of the base member l', 'as indicated at 10.`

The cover 9 is provided with an opening 11, the edges of which are bent or drawn outwardly to forma roll. Through this o eninglLtheconductors from a source o aleen ternating current Ymay extend to the magnet windings. The roll produce-d upon the edges of the opening prevents the cutting of the Wires by the metal.

'The' diaphragmof the horn is indicated at 12. This diaphragm is preferably a disk of metal of any desired thickness and of any Ldesired kind of metal. The edge or periph.

there is an opening through which extends This studis provided with aA the stud 13. K reduced portion that extendsthrough the opening of the diaphragm, and the end of the stud is odset upon the inside of the diaphragm, as indicated at 11i. This simply.

holds the stud to the diaphragm. The stud is provided with a central opening which is threaded and receives a screw 15. The stud at the end which is adjacent the amplifier is slotted, as indicated at 16. This slot permits the outer portion of the stud to securely grip lthe threads of the screw 15 and acts as a lock, for every time the diaphragm moves the'tendency of the slotted portion of the stud 13 will be togrip the screw 15 and prevent its rotation.

The head of the screw 15 is toward the amplifier `8 so that a screw driver may 'be inserted in the head of the amplifier to engage with the screw to turn the screw to any desired position of adjustment. y

The core of the electro-magnet is indicated generally at 18. This core is laminated, that is to say, the. core is made up of a series of thin plates which ivlien'assembled produce the laminated structure. The shape of each of the individual pieces is `clearly shown in l? ig. 1, When built up the core, therefore, may be describedas having a cen tral arm 18fL and side arms 18b which are joined by a base 18C. The laminations of the magnet core are held together by means of a retaining strap 19 which is shown 1n Figs. 5 and 6. This retaining strap is provided with a central offset portion 20, and this central offset portion is provided with a slot 21. The retaining strap has feet 20a-provided with openings by which the retaining member 18 may be held in place.

The `central arm 18a' of the core extends through the slot 21 of the retaining member 19d, the offset portion 2O fitting snugly against the base portion 418cv in the'vspaces provided between the arms 18a and 18?. The offset portion 2O is of slightly greater height than, the height of the head 18. The retaining member 19 is secured to the cup -9 by means of rivets or other suitable holding devices extending through the openingsin the foot 21 of the retaining member 19.

relaves `The retaining member 19 in assembling the core is utilized somewhat as` a gage, that is to say, the opening 21 is made of a size to -receive a definitenumber oflaminated pieces. Therefore, in assembling the horn the central arms 18a having a sufficient number of laminations are thrust through the opening 21 and when the opening 21 is completelyfilled `the right number of vlaminations for a core hasbeen taken. and the retaining member 19`are then ready to be'secured to the cover 9.

The armature for the magnet is indicated at 21. This armature is preferably a circular piece of magnetically permeable material such as soft iron.

This armature is secured to a transverse supporting piece V22. MrExtending transversely of the armature and the piece 22 is a plate against which the lend of screw 15 is adaptedto strike. This plate, armature and piece 22 are united or otherwisel secured together. This piece 22 is provided with slots 23 adjacentfits ends, which slots are adapted to receive the ends of a spring member 24. The spring member is bent somewhat as a The core i yokeand comprises the side pieces 24a and the connecting ,piece 24". piece 24h extends beneath the core 18 and is secured beneath the core and held by the re'- taining member 19, as heretofore described with respect to the core. From this it 'will be seen that the retaining member 19 holds all the parts which are carried bythe cover 9.. The outer ends of the arms 24a engage in the slots 23 formed in the member 22. The members 24a are normally under tension, which tends tospread them apart so that whenthe arms 24a are engaged and held by the member 22 the arms of the spring member are under considerable tension.

The plate which is carried by the armature engages with the end of the screw 15, and the adjustment of the screw 15 may be 'varied so as to vary the free swing ofA the armature 21. v

The energizing coil of the electro-magnet is indicated at 26. .This coil is wound upon a sleeve 27 which fits over a central portiera 18a of the core. This sleeve is split, as indi? ture is attracted, the member 22 is caused to' bend slightly and slightly Hex the arms 24 of the spring 24, As the armature is released the resiliency of the parts which have Thev connecting 1,15 cated at 28, 'so that the sleeve does not form y ing a baseportion of sheet meta-l and hav- .secured tothe uptu'rned flange by an interfolding of the metal of th'e "ii-ange and the end of the amplifier whereby the been flexed causes the armature to strike against the screw 15 carried by the.I diaphragm and s'o the diaphragm is vibrated. As beforerstated, the screw 15 may be adj usted so as to vary the'free swinging inovement of the armature, that is to say, to adl.just the free distance between theend of the arm-ature-f: ff

It will ,rbev seen that in this construct-ionbut two rivets are used to fasten the moving parts to the cap or cover, `furthermore, that the adjustment is secured from the outside of the horn, thereby making unnecessary the removal of the cap'for adjusting purposes."

Furthermore, the edges of the diaphragm are held in a'pdsitive and secure manner and are more satisfactory than screws or retaming bolts.

f Having thus described my what-I'claim isz- 1. n'electric signaling device comprising a central opening with 'an upturned flange surrounding said .'opening, an Aainplifier ofsheet metal, the amplifierbeing of '-the. base ampliieris secured to Ythe baseportiori.

.- 2. Anelectric signa-ling device, comprising a base portion, an olset or grooved portion in saidbase, aY strip of"material within said groovedlornoiisehportion land held therein',

said strip-of material .being provided with threaded openings, there being alinedopen--- ings in the oiset portion of the'lias/e, a`v bracketjprovided with openings wh'ichfregister with`the aoresaidppenings, screws extending through the openings in the bracket "and 'engaging the threads in the aforesaid combination with a diaphragm, an armature adapted to engage the diaphragm, an'electro-magnet for operating the armature, la pair of diverging spring arms, a transverse flexible member engagingV and retainingsaid spring arms, the armature being carried upon said transverse member.

5. In "an electric signaling device,... the combination with a diaphragm, an armature adapted to engage the diaphragm,- an elec? invention,

:Swing of the armattire..` v y f f 8. In an electricgsignaling tions, a retaining tro-magnet for operating the armature, a

transverse flexible member engaging. said armsunder tension, the armature being carried upon said transverse member.

6. In an electric signalingy device, the com;

spring member having' dii-'erging arms, a

bination with 'a diaphragm,l an amature spring member having diverging arms, a transverse' fiexiblemember engaging said arms under ten-sion, the' armature being carried upon said `transverse member, and

the electro-'magnet being mounted between Said' -arr'ns and adjfacentthe armature,

7. lin' an electric signaling device, the com- -bination'with' a diaph ragm, an armature adapted to engage-.the di-aphragm, an' electro-magnetffor" operating the armature, a Y' pair `of diverging spring arms, a transverse flexible member engaging and retaining said adapted to engage-the diaphragm, an electro-magnet` lfor-operating thev armature, a

spring arms under tension, the armature being carried uponsaid-trans'verse member,

and means -for controlling'the amplitude'of i i device, the combination with ad1aphragm,'an armature adapted to engage the diaphragm, an electro-magnet `for operating the armature, a'

pair of diverging spi-'ing arms, a transverse Hexible member engaging and retaining said `spring arms under' tension, the armature" beingA carriedupon said transverse member, and regulable. means for engaging said transverse -iexible member to place'the same under initial tension. f

9.-'Ai1 electric signaling device comprisan electro-magnet, a support therefor,'said electro-magnet bein' extend, thereby retaining the laminations in place an'dsecuring them to the support.

Ving a diaphragm, anfarmature adapted to .engage the'diaphragm to vibrate the. same,

iliade' up of laminarap having an openingthrough which portions of the laminatioiis 10.- An electric signaling device comprising a diaphragm, an armature adapted'to engage the .diaphragm to .vibrate the same,

` an electro-magnet, a' support therefor, said electro-magnet being made up of laminations, a retaining straphaving a central portion with an' opening therein, said opening being adapted to engage with portions of the l'aminations to completely hold the laminations with respect to each other, and other portions of the strap being adapted to be secured to a suitable fastening device.

11. An electric signaling device, comprisengage and vibrate the diaphragm, a lamiing a diaphragm, an armature adapted to nated core,l 'a ysupport therefor, a spring'fV member having extending arms, a retaining member, said retaining member engaging together, said spring member extending bethe parts of the laminated core to hold them neath the core, the retaining member being' secured to the support and holding the core engage and vibrate the diaphragm, a lami-l nated core having a central projecting porf tion, a retaining member havlng an offset central portion with a slot therethrougli,the

laminations of the central portion of the core, extending through the slot in the said retaining member, whereby the laminations `are held together, a support, the said retaining member being secured to the support. i

18. An electric signaling device, comprising a diaphragm, an armature adapted to engage and vibrate the diaphragm, and electro-magnet, a spring member-extending beneath the Core, said spring member havingv dlvergmg arms, a transverse flexible member which supports theV armature, the Said transverse member engaging the outer ends of the arms 'of the spring member.

In testimony whereof, 1 hereunto afIiX my signature.

RLPH R.4 ROOT. 

